Investigation of CO 2 laser treated concrete in terms of water absorption through dissimilar layers

J. Lawrence, C. B. Ho, L. Hao

Research output: Contribution to journalArticle

Abstract

A comprehensive investigation of the effectiveness of a CO 2 laser generated glaze on the absorption characteristics of OPC has been conducted. The experimental results from the absorption tests confirmed that the CO 2 laser generated glaze surface on the OPC had successfully reduced the absorption rate by 77% as compared to the untreated OPC. The presence of dissimilar layers on both the untreated and CO 2 laser treated OPC was established. Two dissimilar layers, which were the OPC material and the concrete material respectively were identified for the untreated concrete. As for the CO: laser treated OPC, four dissimilar layers were identified. These were the glaze, the HAZ, the OPC and the concrete aggregate respectively. For the CO 2 laser treated OPC, the sorptivity of the first layer (CO 2 laser generated glaze) was 0 mm min -1/2 on account of the fact that it is an amorphous structure. The sorptivity of the second layer (HAZ) was 0.057 mm min -1/2, which was 42.5% higher than the third layer (OPC) where the sorptivity value was 0.040 mm min -1/2. Consequently, it was concluded that reduction in the thickness of the HAZ layer and improvement in the quality of glaze layer would further enhance the effectiveness of the CO 2 generated glaze on the OPC surface of the concrete.

Original languageEnglish
Pages (from-to)23-35
Number of pages13
JournalLasers in Engineering
Volume14
Issue number1-2
Publication statusPublished - 19 May 2004
Externally publishedYes

Keywords

  • Absorption
  • Concrete
  • Glaze
  • Laser
  • Ordinary Portland cement (OPC)
  • Water

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering

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